Re: [FFmpeg-devel] avfilter/adelay - interactive commands

From: Paul B Mahol <onemda@gmail.com>
To: FFmpeg development discussions and patches <ffmpeg-devel@ffmpeg.org>
Subject: Re: [FFmpeg-devel] avfilter/adelay - interactive commands
Date: Tue, 18 Jan 2022 18:38:19 +0100
Message-ID: <CAPYw7P5KoZ0v9_B36D3mGjRwEKHih4PvBjCFwSf=6hHrfuXo5w@mail.gmail.com> (raw)
In-Reply-To: <CAKEaJ+GZ75EbW1iCBL60ga5V1PQT9FqYrrvDKAMvF1xkSLLDrg@mail.gmail.com>

On Tue, Jan 18, 2022 at 6:10 PM deiwo deiwo <deiwo101@gmail.com> wrote:

> Hi,
> I have created a proof of concept. Please check if it makes sense and has a
> potential to get merged.
> I did not know whether it would make sense to send it as a patch, so for
> now a pastebin link:
> https://pastebin.com/nAxRj4C9

Delays can be different for each channel.

>
>
> Thanks,
> David Lacko
>
> ut 18. 1. 2022 o 10:09 deiwo deiwo <deiwo101@gmail.com> napísal(a):
>
> > Similar to how one can change volume in the volume filter when there is a
> > zeromq filter preceding the volume filter, then it's possible to send
> > zeromq commands to the volume filter and change the volume dynamically
> > (while the ffmpeg is running).
> > In the case of adelay filter the delay could be changed dynamically, when
> > the user would increase the delay, additional silence would be added and
> > the sample buffer would increase, and when the user would decrease the
> > delay some samples would be skipped in the sample buffer and the buffer
> > size would decrease.
> >
> > The usage for this would be beneficial for live streams, for example when
> > changing the delay of an audio channel requires complete restart of the
> > ffmpeg.
> >
> > ut 18. 1. 2022 o 9:22 Paul B Mahol <onemda@gmail.com> napísal(a):
> >
> >> On Mon, Jan 17, 2022 at 11:02 PM deiwo deiwo <deiwo101@gmail.com>
> wrote:
> >>
> >> > Hello,
> >> > I would like to ask if it makes sense to implement ZeroMQ interactive
> >> > commands for the adelay filter, from the performance and memory point
> of
> >> > view.
> >> > If it does make sense then is it possible to malloc/free/realloc
> memory
> >> > within the command processing function? Can it cause noticeable delays
> >> in
> >> > the stream outputs?
> >> >
> >> > I am new to the ffmpeg development so I am sorry if this kind of
> >> question
> >> > does not belong to this mailing list.
> >> >
> >> >
> >> I fail to see how that would work. Please elaborate your idea.
> >>
> >>
> >>
> >> > Thanks for the response,
> >> > David L
> >> > _______________________________________________
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> >> > ffmpeg-devel@ffmpeg.org
> >> > https://ffmpeg.org/mailman/listinfo/ffmpeg-devel
> >> >
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> >> >
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> >
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